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 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javax.swing.plaf.synth;

import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.BasicEditorPaneUI;
import java.beans.PropertyChangeEvent;

/**
 * Provides the Synth L&amp;F UI delegate for
 * {@link javax.swing.JEditorPane}.
 *
 * @author Shannon Hickey
 * @since 1.7
 */
public class SynthEditorPaneUI extends BasicEditorPaneUI implements SynthUI {

  private SynthStyle style;
  /*
   * I would prefer to use UIResource instad of this.
   * Unfortunately Boolean is a final class
   */
  private Boolean localTrue = Boolean.TRUE;

  /**
   * Creates a new UI object for the given component.
   *
   * @param c component to create UI object for
   * @return the UI object
   */
  public static ComponentUI createUI(JComponent c) {
    return new SynthEditorPaneUI();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void installDefaults() {
    // Installs the text cursor on the component
    super.installDefaults();
    JComponent c = getComponent();
    Object clientProperty =
        c.getClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES);
    if (clientProperty == null) {
      c.putClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES, localTrue);
    }
    updateStyle(getComponent());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void uninstallDefaults() {
    SynthContext context = getContext(getComponent(), ENABLED);
    JComponent c = getComponent();
    c.putClientProperty("caretAspectRatio", null);

    style.uninstallDefaults(context);
    context.dispose();
    style = null;

    Object clientProperty =
        c.getClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES);
    if (clientProperty == localTrue) {
      c.putClientProperty(JEditorPane.HONOR_DISPLAY_PROPERTIES,
          Boolean.FALSE);
    }
    super.uninstallDefaults();
  }

  /**
   * This method gets called when a bound property is changed
   * on the associated JTextComponent.  This is a hook
   * which UI implementations may change to reflect how the
   * UI displays bound properties of JTextComponent subclasses.
   * This is implemented to rebuild the ActionMap based upon an
   * EditorKit change.
   *
   * @param evt the property change event
   */
  @Override
  protected void propertyChange(PropertyChangeEvent evt) {
    if (SynthLookAndFeel.shouldUpdateStyle(evt)) {
      updateStyle((JTextComponent) evt.getSource());
    }
    super.propertyChange(evt);
  }

  private void updateStyle(JTextComponent comp) {
    SynthContext context = getContext(comp, ENABLED);
    SynthStyle oldStyle = style;

    style = SynthLookAndFeel.updateStyle(context, this);

    if (style != oldStyle) {
      SynthTextFieldUI.updateStyle(comp, context, getPropertyPrefix());

      if (oldStyle != null) {
        uninstallKeyboardActions();
        installKeyboardActions();
      }
    }
    context.dispose();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public SynthContext getContext(JComponent c) {
    return getContext(c, getComponentState(c));
  }

  private SynthContext getContext(JComponent c, int state) {
    return SynthContext.getContext(c, style, state);
  }

  private int getComponentState(JComponent c) {
    return SynthLookAndFeel.getComponentState(c);
  }

  /**
   * Notifies this UI delegate to repaint the specified component.
   * This method paints the component background, then calls
   * the {@link #paint(SynthContext, Graphics)} method.
   *
   * <p>In general, this method does not need to be overridden by subclasses.
   * All Look and Feel rendering code should reside in the {@code paint} method.
   *
   * @param g the {@code Graphics} object used for painting
   * @param c the component being painted
   * @see #paint(SynthContext, Graphics)
   */
  @Override
  public void update(Graphics g, JComponent c) {
    SynthContext context = getContext(c);

    SynthLookAndFeel.update(context, g);
    paintBackground(context, g, c);
    paint(context, g);
    context.dispose();
  }

  /**
   * Paints the specified component.
   *
   * @param context context for the component being painted
   * @param g the {@code Graphics} object used for painting
   * @see #update(Graphics, JComponent)
   */
  protected void paint(SynthContext context, Graphics g) {
    super.paint(g, getComponent());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void paintBackground(Graphics g) {
    // Overriden to do nothing, all our painting is done from update/paint.
  }

  void paintBackground(SynthContext context, Graphics g, JComponent c) {
    context.getPainter().paintEditorPaneBackground(context, g, 0, 0,
        c.getWidth(), c.getHeight());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void paintBorder(SynthContext context, Graphics g, int x,
      int y, int w, int h) {
    context.getPainter().paintEditorPaneBorder(context, g, x, y, w, h);
  }
}
